Receiver Device Applied to Mimo System and Control Method Using the Same

1. A receiver device used in a multi-input multi-output communication system, the receiver device comprising: a plurality of receiving antennas, used to receive a first number of analog radio frequency signals; a plurality of radio frequency receivers, respectively coupled to the receiving antennas, wherein the radio frequency receivers are used to process the first number of the analog radio frequency signals and generate the first number of analog baseband signals; a switch device, electrically connected to the radio frequency receivers, wherein the switch device receives the first number of the analog baseband signals and outputs, according to mapping information, a second number of analog baseband signals; a configurable precision analog-to-digital converter, electrically connected to the switch device, receiving the second number of the analog baseband signals, and generating a third number of first digital baseband signals, wherein the third number is less than the second number and the configurable precision analog-to-digital converter comprises: a plurality of first analog-to-digital converters, used to convert the second number of the analog baseband signals into the second number of second digital baseband signals, wherein the configurable precision analog-to-digital converter combines, according to converter configurable information, at least two of the first analog-to-digital converters as at least one second analog-to-digital converter so that the total number of the rest of the first analog-to-digital converters and the at least one second analog-to-digital converter is equal to the third number, and resolution of each of the second analog-to-digital converters is higher than resolution of each of the first analog-to-digital converters; and a bit combiner, used to converts the second number of the second digital baseband signals into the third number of the first digital baseband signals; a baseband processor, electrically connected to the switch device and the configurable precision analog-to-digital converter, and used to process the third number of the first digital baseband signals and output channel information according to the first digital baseband signals; and an analog-to-digital conversion controller, respectively and electrically connected to the switch device, the configurable precision analog-to-digital converter and the baseband processor, wherein the analog-to-digital conversion controller determines the mapping information and the converter configurable information according to the channel information; and wherein the analog-to-digital conversion controller respectively outputs the mapping information and the converter configurable information to the switch device and the configurable precision analog-to-digital converter.

2. The receiver device as claimed in claim 1 , wherein the bit combiner integrates the second digital baseband signals outputted from each of the at least one second analog-to-digital converter as the single first digital baseband signal; and wherein the baseband processor obtains the channel information by the first digital baseband signals corresponding to the at least one second analog-to-digital converter.

3. The receiver device as claimed in claim 1 , wherein resolutions of the first analog-to-digital converters are not all the same.

4. The receiver device as claimed in claim 1 , wherein the second analog-to-digital converter is a pseudo high-precision analog-to-digital converter.

5. The receiver device as claimed in claim 1 , wherein the analog-to-digital conversion controller further adjusts the mapping information and the converter configurable information according to a decoding result of a baseband processor of the receiver device so that the configurable precision analog-to-digital converter adjusts a resolution of the at least one second analog-to-digital converter.

6. A control method applied to the receiver device as claimed in claim 1 , the control method comprising: determining whether the analog-to-digital conversion controller has full channel statistical information of the multi-input multi-output communication system or not according to the channel information; informing the receiver device to be in a first mode or a second mode according to obtaining the full channel statistical information or not; informing the receiver device to be in the first mode if the full channel statistical information is not obtained, wherein when the receiver device is in the first mode, the analog-to-digital conversion controller periodically changes the mapping information so that each of the second analog-to-digital converters in turn outputs each of the first digital baseband signals corresponding to each of the receiving antennas.

7. The receiver device as claimed in claim 2 , wherein when the analog-to-digital conversion controller does not have full channel statistical information of the multi-input multi-output communication system, the analog-to-digital conversion controller informs the receiver device being in a first mode; wherein when the receiver device is in the first mode, the analog-to-digital conversion controller periodically changes the mapping information so that each of the second analog-to-digital converters in turn outputs each of the first digital baseband signals corresponding to each of the receiving antennas; and wherein the baseband processor obtains the channel information according to the first digital baseband signals which are corresponding to the at least one second analog-to-digital converter.

8. The receiver device as claimed in claim 2 , wherein when the analog-to-digital conversion controller obtains full channel statistical information of the multi-input multi-output communication system according to the channel information, the analog-to-digital conversion controller informs the receiver device being in a second mode and the analog-to-digital conversion controller that periodically changes the mapping information in a coherence time of the multi-input multi-output communication system according to the full channel statistical information; wherein the receiver device is in the second mode, the analog-to-digital conversion controller adjusts, according to the full channel statistical information, the mapping information and the converter configurable information to change configuration of the configurable precision analog-to-digital converter.

9. The receiver device as claimed in claim 5 , wherein when the resolution of the at least one second analog-to-digital converter is increased, the number of the first analog-to-digital converters composed in the second analog-to-digital converter increases.

10. The control method as claimed in claim 6 , further comprising: integrating the second digital baseband signals outputted from each of the at least one second analog-to-digital converter as the single first digital baseband signal; and obtaining, by the baseband processor, the channel information according to the first digital baseband signals which are corresponding to the at least one second analog-to-digital converter.

11. The receiver device as claimed in claim 8 , wherein when the analog-to-digital conversion controller obtains that a current channel changing rate exceeds a predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller adjusts the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter increases the number of the at least one second analog-to-digital converter; and wherein the configurable precision analog-to-digital converter sequentially receives the analog radio frequency signals corresponding to the receiving antennas.

12. The receiver device as claimed in claim 8 , wherein when the analog-to-digital conversion controller obtains that a current channel changing rate exceeds a predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller adjusts the mapping information so that the switch device discards the analog radio frequency signal of the receiving antenna having the worst channel effect; and wherein the analog-to-digital conversion controller adjusts the converter configurable information so that the number of the at least one second analog-to-digital converter of the configurable precision analog-to-digital converter remains unchanged.

13. The receiver device as claimed in claim 8 , wherein when the analog-to-digital conversion controller obtains that a current channel changing rate is lower than a predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller adjusts the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter decreases the number of the at least one second analog-to-digital converter.

14. The receiver device as claimed in claim 8 , wherein when the analog-to-digital conversion controller obtains that a current channel changing rate is lower than a predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller does not adjust the converter configurable information so that the number of the at least one second analog-to-digital converter of the configurable precision analog-to-digital converter remains unchanged.

15. The control method as claimed in claim 10 , further comprising informing the receiver device to be in the second mode if the full channel statistical information is obtained; changing, periodically, the mapping information in a coherence time of the multi-input multi-output communication system according to the full channel statistical information; and adjusting, according to the full channel statistical information, the mapping information and the converter configurable information to change configuration of the configurable precision analog-to-digital converter if the receiver device is in the second mode.

16. The control method as claimed in claim 10 , further comprising adjusting, according to a decoding result of a baseband processor of the receiver device, the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter adjusts a resolution of the at least one second analog-to-digital converter.

17. The receiver device as claimed in claim 13 , wherein when the analog-to-digital conversion controller obtains that the current channel changing rate is lower than the predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller adjusts the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter increases the number of the first analog-to-digital converters composed in each of the at least one second analog-to-digital converter.

18. The control method as claimed in claim 15 , wherein when the analog-to-digital conversion controller obtains that a current channel changing rate exceeds a predetermined changing rate according to the full channel statistical information, the control method further comprises: adjusting the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter increases the number of the at least one second analog-to-digital converter; and sequentially receiving, by the configurable precision analog-to-digital converter, the analog radio frequency signals corresponding to the receiving antennas.

19. The control method as claimed in claim 15 , wherein when the analog-to-digital conversion controller obtains that a current channel changing rate exceeds a predetermined changing rate according to the full channel statistical information, the control method further comprises: adjusts the mapping information so that the switch device discards the analog radio frequency signal of the receiving antenna having the worst channel effect; and adjusting the converter configurable information so that the number of the at least one second analog-to-digital converter of the configurable precision analog-to-digital converter remains unchanged.

20. The control method as claimed in claim 15 , further comprising when the analog-to-digital conversion controller obtains that a current channel changing rate is lower than a predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller adjusts the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter reduces the number of the at least one second analog-to-digital converter.

21. The control method as claimed in claim 15 , further comprising when the analog-to-digital conversion controller obtains that a current channel changing rate is lower than a predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller does not adjust the converter configurable information so that the number of the at least one second analog-to-digital converter of the configurable precision analog-to-digital converter remains unchanged.

22. The control method as claimed in claim 16 , wherein when the resolution of the at least one second analog-to-digital converter is increased, the number of the first analog-to-digital converters composed in the second analog-to-digital converter increases.

23. The control method as claimed in claim 20 , further comprising when the analog-to-digital conversion controller obtains that the current channel changing rate is lower than the predetermined changing rate according to the full channel statistical information, the analog-to-digital conversion controller adjusts the mapping information and the converter configurable information so that the configurable precision analog-to-digital converter increases the number of the first analog-to-digital converters composed in each of the at least one second analog-to-digital converter.